Author: grehan
Date: Wed Apr 2 20:18:17 2014
New Revision: 264055
URL: http://svnweb.freebsd.org/changeset/base/264055
Log:
Add support for the virtio RNG entropy-source device.
Call through to /dev/random synchronously to fill
virtio buffers with RNG data.
Tested with FreeBSD-CURRENT and Ubuntu guests.
Submitted by: Leon Dang
Discussed with: markm
MFC after: 3 weeks
Sponsored by: Nahanni Systems
Added:
head/usr.sbin/bhyve/pci_virtio_rnd.c (contents, props changed)
Modified:
head/usr.sbin/bhyve/Makefile
head/usr.sbin/bhyve/bhyve.8
head/usr.sbin/bhyve/virtio.h
Modified: head/usr.sbin/bhyve/Makefile
==============================================================================
--- head/usr.sbin/bhyve/Makefile Wed Apr 2 19:51:29 2014
(r264054)
+++ head/usr.sbin/bhyve/Makefile Wed Apr 2 20:18:17 2014
(r264055)
@@ -26,6 +26,7 @@ SRCS= \
pci_passthru.c \
pci_virtio_block.c \
pci_virtio_net.c \
+ pci_virtio_rnd.c \
pci_uart.c \
pm.c \
pmtmr.c \
Modified: head/usr.sbin/bhyve/bhyve.8
==============================================================================
--- head/usr.sbin/bhyve/bhyve.8 Wed Apr 2 19:51:29 2014 (r264054)
+++ head/usr.sbin/bhyve/bhyve.8 Wed Apr 2 20:18:17 2014 (r264055)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd January 27, 2014
+.Dd April 2, 2014
.Dt BHYVE 8
.Os
.Sh NAME
@@ -129,6 +129,8 @@ PCI pass-through device.
Virtio network interface.
.It Li virtio-blk
Virtio block storage interface.
+.It Li virtio-rnd
+Virtio RNG interface.
.It Li ahci-cd
AHCI controller attached to an ATAPI CD/DVD.
.It Li ahci-hd
Added: head/usr.sbin/bhyve/pci_virtio_rnd.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/usr.sbin/bhyve/pci_virtio_rnd.c Wed Apr 2 20:18:17 2014
(r264055)
@@ -0,0 +1,189 @@
+/*-
+ * Copyright (c) 2014 Nahanni Systems Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer
+ * in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * virtio entropy device emulation.
+ * Randomness is sourced from /dev/random which does not block
+ * once it has been seeded at bootup.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/linker_set.h>
+#include <sys/uio.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+#include <pthread.h>
+
+#include "bhyverun.h"
+#include "pci_emul.h"
+#include "virtio.h"
+
+#define VTRND_RINGSZ 64
+
+
+static int pci_vtrnd_debug;
+#define DPRINTF(params) if (pci_vtrnd_debug) printf params
+#define WPRINTF(params) printf params
+
+/*
+ * Per-device softc
+ */
+struct pci_vtrnd_softc {
+ struct virtio_softc vrsc_vs;
+ struct vqueue_info vrsc_vq;
+ pthread_mutex_t vrsc_mtx;
+ uint64_t vrsc_cfg;
+ int vrsc_fd;
+};
+
+static void pci_vtrnd_reset(void *);
+static void pci_vtrnd_notify(void *, struct vqueue_info *);
+
+static struct virtio_consts vtrnd_vi_consts = {
+ "vtrnd", /* our name */
+ 1, /* we support 1 virtqueue */
+ 0, /* config reg size */
+ pci_vtrnd_reset, /* reset */
+ pci_vtrnd_notify, /* device-wide qnotify */
+ NULL, /* read virtio config */
+ NULL, /* write virtio config */
+ 0, /* our capabilities */
+};
+
+
+static void
+pci_vtrnd_reset(void *vsc)
+{
+ struct pci_vtrnd_softc *sc;
+
+ sc = vsc;
+
+ DPRINTF(("vtrnd: device reset requested !\n"));
+ vi_reset_dev(&sc->vrsc_vs);
+}
+
+
+static void
+pci_vtrnd_notify(void *vsc, struct vqueue_info *vq)
+{
+ struct iovec iov;
+ struct pci_vtrnd_softc *sc;
+ int len;
+
+ sc = vsc;
+
+ vq_startchains(vq);
+
+ if (sc->vrsc_fd < 0) {
+ vq_endchains(vq, 0);
+ return;
+ }
+
+ while (vq_has_descs(vq)) {
+ vq_getchain(vq, &iov, 1, NULL);
+
+ len = read(sc->vrsc_fd, iov.iov_base, iov.iov_len);
+
+ DPRINTF(("vtrnd: vtrnd_notify(): %d\r\n", len));
+
+ /* Catastrophe if unable to read from /dev/random */
+ assert(len > 0);
+
+ /*
+ * Release this chain and handle more
+ */
+ vq_relchain(vq, len);
+ }
+ vq_endchains(vq, 1); /* Generate interrupt if appropriate. */
+}
+
+
+static int
+pci_vtrnd_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
+{
+ struct pci_vtrnd_softc *sc;
+ int fd;
+ int len;
+ uint8_t v;
+
+ /*
+ * Should always be able to open /dev/random.
+ */
+ fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
+
+ assert(fd >= 0);
+
+ /*
+ * Check that device is seeded and non-blocking.
+ */
+ len = read(fd, &v, sizeof(v));
+ if (len <= 0) {
+ WPRINTF(("vtrnd: /dev/random not ready, read(): %d", len));
+ return (1);
+ }
+
+ sc = malloc(sizeof(struct pci_vtrnd_softc));
+ memset(sc, 0, sizeof(struct pci_vtrnd_softc));
+
+ vi_softc_linkup(&sc->vrsc_vs, &vtrnd_vi_consts, sc, pi, &sc->vrsc_vq);
+ sc->vrsc_vs.vs_mtx = &sc->vrsc_mtx;
+
+ sc->vrsc_vq.vq_qsize = VTRND_RINGSZ;
+
+ /* keep /dev/random opened while emulating */
+ sc->vrsc_fd = fd;
+
+ /* initialize config space */
+ pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_RANDOM);
+ pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
+ pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_CRYPTO);
+ pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_ENTROPY);
+
+ if (vi_intr_init(&sc->vrsc_vs, 1, fbsdrun_virtio_msix()))
+ return (1);
+ vi_set_io_bar(&sc->vrsc_vs, 0);
+
+ return (0);
+}
+
+
+struct pci_devemu pci_de_vrnd = {
+ .pe_emu = "virtio-rnd",
+ .pe_init = pci_vtrnd_init,
+ .pe_barwrite = vi_pci_write,
+ .pe_barread = vi_pci_read
+};
+PCI_EMUL_SET(pci_de_vrnd);
Modified: head/usr.sbin/bhyve/virtio.h
==============================================================================
--- head/usr.sbin/bhyve/virtio.h Wed Apr 2 19:51:29 2014
(r264054)
+++ head/usr.sbin/bhyve/virtio.h Wed Apr 2 20:18:17 2014
(r264055)
@@ -209,6 +209,7 @@ struct vring_used {
#define VIRTIO_VENDOR 0x1AF4
#define VIRTIO_DEV_NET 0x1000
#define VIRTIO_DEV_BLOCK 0x1001
+#define VIRTIO_DEV_RANDOM 0x1002
/*
* PCI config space constants.
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